Structured Slow Solar Wind Variability: Streamer-blob Flux Ropes and Torsional Alfven Waves

被引:56
作者
Higginson, A. K. [1 ]
Lynch, B. J. [2 ]
机构
[1] Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA
[2] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
关键词
magnetohydrodynamics (MHD); solar-terrestrial relations; solar wind; Sun: corona; Sun: heliosphere; Sun: magnetic fields; HELIOSPHERIC PLASMA SHEETS; MAGNETIC-FIELD; CORONAL HOLES; MAGNETOHYDRODYNAMIC MODELS; RECONNECTION-DRIVEN; AU; ACCELERATION; TRANSIENTS; ERUPTIONS; DYNAMICS;
D O I
10.3847/1538-4357/aabc08
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The slow solar wind exhibits strong variability on timescales from minutes to days, likely related to magnetic reconnection processes in the extended solar corona. Higginson et al. presented a numerical magnetohydrodynamic simulation that showed interchange magnetic reconnection is ubiquitous and most likely responsible for releasing much of the slow solar wind, in particular along topological features known as the Separatrix-Web (S-Web). Here, we continue our analysis, focusing on two specific aspects of structured slow solar wind variability. The first type is present in the slow solar wind found near the heliospheric current sheet (HCS), and the second we predict should be present everywhere S-Web slow solar wind is observed. For the first type, we examine the evolution of three-dimensional magnetic flux ropes formed at the top of the helmet streamer belt by reconnection in the HCS. For the second, we examine the simulated remote and in situ signatures of the large-scale torsional Alfven wave (TAW), which propagates along an S-Web arc to high latitudes. We describe the similarities and differences between the reconnection-generated flux ropes in the HCS, which resemble the well-known "streamer blob" observations, and the similarly structured TAW. We discuss the implications of our results for the complexity of the HCS and surrounding plasma sheet and the potential for particle acceleration, as well as the interchange reconnection scenarios that may generate TAWs in the solar corona. We discuss predictions from our simulation results for the dynamic slow solar wind in the extended corona and inner heliosphere.
引用
收藏
页数:13
相关论文
共 93 条
[1]   An MHD code for the study of magnetic structures in the solar wind [J].
Allred, J.C. ;
MacNeice, P.J. .
Computational Science and Discovery, 2015, 8 (01)
[2]  
[Anonymous], AIP C P
[3]   Structure and dynamics of the sun's open magnetic field [J].
Antiochos, S. K. ;
DeVore, C. R. ;
Karpen, J. T. ;
Mikic, Z. .
ASTROPHYSICAL JOURNAL, 2007, 671 (01) :936-946
[4]   HELICITY CONDENSATION AS THE ORIGIN OF CORONAL AND SOLAR WIND STRUCTURE [J].
Antiochos, S. K. .
ASTROPHYSICAL JOURNAL, 2013, 772 (01)
[5]   A MODEL FOR THE SOURCES OF THE SLOW SOLAR WIND [J].
Antiochos, S. K. ;
Mikic, Z. ;
Titov, V. S. ;
Lionello, R. ;
Linker, J. A. .
ASTROPHYSICAL JOURNAL, 2011, 731 (02)
[6]   A NUMERICAL MODEL OF STANDARD TO BLOWOUT JETS [J].
Archontis, V. ;
Hood, A. W. .
ASTROPHYSICAL JOURNAL LETTERS, 2013, 769 (02)
[7]   Improvement in the prediction of solar wind conditions using near-real time solar magnetic field updates [J].
Arge, CN ;
Pizzo, VJ .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2000, 105 (A5) :10465-10479
[8]   Acceleration of the high speed solar wind in coronal holes [J].
Axford, WI ;
McKenzie, JF ;
Sukhorukova, GV ;
Banaszkiewicz, M ;
Czechowski, A ;
Ratkiewicz, R .
SPACE SCIENCE REVIEWS, 1999, 87 (1-2) :25-41
[9]  
BURLAGA L, 1981, J GEOPHYS RES-SPACE, V86, P6673, DOI 10.1029/JA086iA08p06673
[10]   MAGNETIC CLOUDS AND FORCE-FREE FIELDS WITH CONSTANT-ALPHA [J].
BURLAGA, LF .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1988, 93 (A7) :7217-7224